Fan



FIG. 1 is a front perspective view of a fan showing the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof, the bottom view, the right side view, and the left side view are mirror images of FIG. 4; and,

FIG. 5 is a rear perspective view thereof.

The broken lines in the drawings depict parts of the fan that form no part of the claimed design. 

CLAIM The ornamental design for a fan, as shown and described. 